Partial H-plane bandpass filters based on substrate integrated folded waveguide (SIFW)

In this paper, two types of partial H-plane bandpass filter are proposed, which are implemented by substrate integrated folded waveguide (SIFW). These filters have advantages of compact, easy for integration, low cost, and mass-producible properties. The presented partial H-plane bandpass filter with H-plane septa has the similar frequency responses as those of traditional E-plane waveguide filter. Another partial H-plane bandpass filter is implemented by inserting H-plane slots in H-plane metal vane. Two filters are designed using the proposed two types of partial H-plane filters. The vertical metal walls of SIFW are realized by closely spaced metallic vias. The tapered line is used as transition between SIFW and microstrip. The two designed partial H-plane filters exhibits excellent performances by simulation.